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import { InworkService } from '../../inwork/inwork.service';
import { ArticleService } from '../article.service';
import { computed, DestroyRef, inject, Injectable, Signal, signal } from '@angular/core';
import { takeUntilDestroyed, toSignal } from '@angular/core/rxjs-interop';
import { LoggerService, NotificationService } from '@drevo-web/core';
import {
ApprovalStatus,
ArticleHistoryItem,
ArticleHistoryParams,
formatDateHeader,
InworkItem,
} from '@drevo-web/shared';
export type HistoryFilter =
| 'all'
| 'unchecked'
| 'unfinished'
| 'unmarked'
| 'outside_dictionaries'
| 'required'
| 'my';
export type HistoryDisplayItem =
| { readonly type: 'header'; readonly date: string }
| { readonly type: 'version'; readonly data: ArticleHistoryItem }
| { readonly type: 'inwork-header' }
| { readonly type: 'inwork-item'; readonly data: InworkItem; readonly isOwn: boolean };
/**
* Builds display items with date headers inserted between date groups.
*
* @param items - Flat list of history items sorted by date descending
* @param referenceDate - Date used for relative date formatting (e.g. "Сегодня")
* @returns Items interleaved with date group headers
*/
export function buildDisplayItems(
items: readonly ArticleHistoryItem[],
referenceDate: Date,
): readonly HistoryDisplayItem[] {
if (items.length === 0) return [];
const result: HistoryDisplayItem[] = [];
let lastDateKey = '';
for (const item of items) {
const dateKey = formatDateHeader(item.date, referenceDate);
if (dateKey !== lastDateKey) {
result.push({ type: 'header', date: dateKey });
lastDateKey = dateKey;
}
result.push({ type: 'version', data: item });
}
return result;
}
export const trackByFn = (_index: number, item: HistoryDisplayItem): string => {
if (item.type === 'header') return `header-${item.date}`;
if (item.type === 'inwork-header') return 'inwork-header';
if (item.type === 'inwork-item') return `inwork-${item.data.title}-${item.data.author}`;
return `version-${item.data.versionId}`;
};
export interface ArticleHistoryConfig {
readonly articleId?: Signal<number | undefined>;
}
@Injectable()
export class ArticleHistoryService {
private readonly destroyRef = inject(DestroyRef);
private readonly articleService = inject(ArticleService);
private readonly authService = inject(AuthService);
private readonly inworkService = inject(InworkService);
private readonly notificationService = inject(NotificationService);
private readonly logger = inject(LoggerService).withContext('ArticleHistoryService');
private readonly _historyItems = signal<readonly ArticleHistoryItem[]>([]);
private readonly _inworkItems = signal<readonly InworkItem[]>([]);
private readonly _isLoading = signal(false);
private readonly _isLoadingMore = signal(false);
private readonly _totalItems = signal(0);
private readonly _currentPage = signal(1);
private readonly _activeFilter = signal<HistoryFilter>('all');
private readonly _hasError = signal(false);
private readonly _referenceDate = signal(new Date());
private articleId?: Signal<number | undefined>;
readonly isLoading = this._isLoading.asReadonly();
readonly isLoadingMore = this._isLoadingMore.asReadonly();
readonly activeFilter = this._activeFilter.asReadonly();
readonly hasError = this._hasError.asReadonly();
private readonly currentUser = toSignal(this.authService.user$);
readonly isAuthenticated = computed(() => !!this.currentUser());
readonly hasItems = computed(() => this._historyItems().length > 0 || this._inworkItems().length > 0);
readonly displayItems = computed<readonly HistoryDisplayItem[]>(() => {
const historyItems = buildDisplayItems(this._historyItems(), this._referenceDate());
const inworkItems = this._inworkItems();
if (inworkItems.length === 0) return historyItems;
const currentName = this.currentUser()?.name;
const inworkDisplayItems: HistoryDisplayItem[] = [
{ type: 'inwork-header' },
...inworkItems.map(item => ({
type: 'inwork-item' as const,
data: item,
isOwn: item.author === currentName,
})),
];
return [...inworkDisplayItems, ...historyItems];
});
readonly displayTotalItems = computed(() => {
const inworkCount = this._inworkItems().length;
const inworkDisplayCount = inworkCount > 0 ? inworkCount + 1 : 0;
const total = this._totalItems();
if (total === 0) return inworkDisplayCount;
const loadedDisplayCount = this.displayItems().length;
const loadedItemCount = this._historyItems().length;
if (loadedItemCount >= total) return loadedDisplayCount;
return loadedDisplayCount + (total - loadedItemCount);
});
readonly inworkVersionIds = computed(
() =>
new Set(
this._inworkItems()
.filter(item => item.id > 0)
.map(item => item.id),
),
);
init(config?: ArticleHistoryConfig): void {
this.articleId = config?.articleId;
this.loadInworkIfNeeded();
this.loadHistory();
}
onFilterChange(filter: HistoryFilter): void {
if (this._activeFilter() === filter) return;
this._activeFilter.set(filter);
this._historyItems.set([]);
this._currentPage.set(1);
this._totalItems.set(0);
this.logger.info('Filter changed', { filter });
this.loadInworkIfNeeded();
this.loadHistory();
}
onLoadMore(): void {
Iif (this._isLoading() || this._isLoadingMore()) return;
if (this._historyItems().length >= this._totalItems()) return;
this._currentPage.update(p => p + 1);
this.loadHistory(true);
}
onCancelInwork(title: string): void {
this.inworkService
.clearEditing(title)
.pipe(takeUntilDestroyed(this.destroyRef))
.subscribe({
next: () => {
this._inworkItems.update(items => items.filter(item => item.title !== title));
this.logger.info('Cleared inwork editing mark', { title });
},
error: err => {
this.logger.error('Failed to clear editing mark', err);
this.notificationService.error('Не удалось снять метку редактирования');
},
});
}
private loadInworkIfNeeded(): void {
if (this.articleId || this._activeFilter() !== 'all') {
this._inworkItems.set([]);
return;
}
this.inworkService
.getInworkList()
.pipe(takeUntilDestroyed(this.destroyRef))
.subscribe(items => this._inworkItems.set(items));
}
private loadHistory(loadMore = false): void {
if (loadMore) {
this._isLoadingMore.set(true);
} else {
this._isLoading.set(true);
}
this._hasError.set(false);
const params = this.buildParams();
if (!params) {
this._isLoading.set(false);
this._isLoadingMore.set(false);
return;
}
this.articleService
.getArticlesHistory(params)
.pipe(takeUntilDestroyed(this.destroyRef))
.subscribe({
next: response => {
if (loadMore) {
this._historyItems.update(items => [...items, ...response.items]);
} else {
this._historyItems.set(response.items);
this._referenceDate.set(new Date());
}
this._totalItems.set(response.total);
this._isLoading.set(false);
this._isLoadingMore.set(false);
},
error: error => {
this.logger.error('Failed to load article history', error);
if (loadMore) {
this._isLoadingMore.set(false);
this._currentPage.update(p => p - 1);
} else {
this._isLoading.set(false);
this._hasError.set(true);
}
},
});
}
private buildParams(): ArticleHistoryParams | undefined {
let base: ArticleHistoryParams = {
page: this._currentPage(),
};
if (this.articleId) {
const id = this.articleId();
if (!id) {
this.logger.error('Cannot load history: article ID not available');
return undefined;
}
base = { ...base, articleId: id };
}
const filter = this._activeFilter();
if (filter === 'unchecked') {
return { ...base, approved: ApprovalStatus.Pending };
}
if (
filter === 'unfinished' ||
filter === 'unmarked' ||
filter === 'outside_dictionaries' ||
filter === 'required'
) {
this.logger.info('Filter not yet supported by backend', {
filter,
});
return base;
}
if (filter === 'my') {
const user = this.currentUser();
if (!user) {
this.logger.error('Cannot filter by author: user not loaded');
return undefined;
}
return { ...base, author: user.login };
}
return base;
}
}
|